Autodot-transmitter.



P. B. DELANY.

AUTODO'I' TRANSMITTER. APPLICATION rum) JUNE 21, 1905.

Patented Apr. 13, 1909.

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A 770/?NE Y THE NORRIS PETERS co., WASHINGTON, n, c.

UNITED STATES PATENT orrion.

PATRICK B. DELANY, OF SOUTH ORANGE, NEW JERSEY.

AUTODOT-TRAN'SMITTER.

To all whom it may concern:

Be it known that I, PATRICK B. DELANY, a citizen of the United States, residing at South Orange, county of Essex, State of New Jersey, have invented a certain new and useful Improved Autodot-Transmitter, of which the following is a specification.

In so-called auto dot transmitters, dots according to Morse or other codes are automatically transmitted during the time the operator holds the transmitting key in dot position. Various styles of instruments of this general character or type have heretofore been devised by me and others.

The drawing shows the invention embodied in a form which experience has demonstrated to be highly efficient.

In apparatus constructed in accordance with this invention, there is a movable weight whose impact or momentum controls or governs the rate of vibration or oscillation of a part or lever acting automatically to effect transmission of dots while the transmitting key is held in dot position.

The particular construction illustrated is as follows. a is a transmitting key maintained in neutral or central position by appropriate springs and connected through a local battery lb with one terminal of the winding of an electro magnet 6 whose other terminal is connected by wire 0 with contact post d at one side of the key. The last named terminal of the electro magnet is also connected by wire 0 through separable contacts f, g, and by wire it through a resistance Rh with contact post 2'- on the other side of the key. j is the armature lever of magnet and is normally retracted against its back post by a suitable spring. This lever is provided with a cross arm is upon which, on one side of the armature lever, is mounted to slide a weight at whose movement is limited by a stop collar a adjustably mounted on the cross bar by means of a clamping screw. On the opposite side of the armature lever, the cross bar carries a weight 0, adjustable, but held in position by a clamping screw. Normally, the armature lever spring draws the lever against its back stop and contacts f, g, are closed and the movable or sliding weight is in position nearest the armature lever. When the transmitting key is moved to dot position,that is to say, against its contact post i, the magnet is energized and the armature lever attracted and Specification of Letters Patent.

Application filed June 21, 1908.

Patented April 13, 1909.

Serial No. 322,685.

in its forward movement a projection 12 carried thereby lifts contact f out of contact with 9 after which the lever strikes its front contact post. When arrested by abutting against its front contact post, the momentum of the movable or sliding weight causes it to continue in the direction of movement until arrested by its stop a. The circuit now being open at f, g, the spring of the armature lever retracts it but, when the lever is arrested by its back stop, the weight is caused by its momentum to move in the direction of movement until arrested by the armature lever or a projection thereon. In this way automatic vibration of the lever is made slower and more positive, being delayed at the end of each forward or backward eX- cursion by impact of the weight. The extent of movement of the weight may be regulated so that the movements of the lever will be uniform. The fixed, but adjustable, weight 0 affords regulation or adjustment of the center of gravity. This weight might be left free to move as the armature lever vibrates, or might be dispensed with, but experience shows that more satisfactory results are obtained when it is used and fixed in position. The described arrangement affords a normal rate of vibration of the armature lever which is capable of control or adjustment by increase or decrease of the strength of the retractile spring applied to the lever. The momentum action or impact of the sliding weight serves to render more slow and positive the return of the armature lever from either front or back position. When the key is moved to the left against its contact post (Z, the local circuit ZZ), remains closed so long as the key is held in position.

Another feature of this invention consists in actuating the armature lever for dot transmission by a weaker current than is used for the dash movements. This is desirable because of the fact that with the automatic make and break of the circuit, the dot impulses transmitted by the lever seem to be out of proportion to the normally transmitted dash impulses. By placing a resistance in the local dot circuit, thereby reducing the current in the winding of the magnet, the automatic dot action is made more even and natural with reference to the normally formed dashes.

Impulses may be sent into the line as follows: MB is the transmitting battery connectedwith a yielding contact g normally held away from the line contact 1' by projection s on the armature lever. When the armature lever moves forward, by reason of attraction of its magnet, contacts q, 1', are allowed to close and an impulse of current corresponding in duration to the latter part of the forward movement of the armature l ver and the early part of its return movement is sent into the line and is made manifest by the relay 6 and sounder a which instruments, in ordinary Morse operation, will serve for reception. The relay and sounder at the distant station are, of course, similarly actuated. lVhen it is desired to receive signals from a distant station, switch 11 is closed to shunt contacts 1", and close the line in the usual way.

I claim as my invention:

1. In a telegraphic transmitter of the general character described, an electro-magnet, its armature lever, and a loosely mounted sliding impact weight set into motion by said armature lever.

2. In a telegraphic transmitter of the general character described, an electro-magnet, its armature lever, and a loosely mounted sliding impact weight set into motion by said lever.

8. In a telegraphic transmitter of the general character described a contact controlling lever and a supplementary impact device sliding thereon and tending by its momentum to retain the lever in either of its po sitions.

at. In a telegraphic transmitter of the general character described a contact controlling lever and a loosely mounted supplementary momentum device tending to retain the lever in either of its positions.

5. In a telegraphic transmitter of the general character described, the combination with an electro-magnet and its vertically disposed armature lever, of a movable member carried thereby and adjustable transversely thereto to control the center of gravity of said armature lever.

6. In a telegraphic transmitter of the general character described, the combination with an electro-magnet and its armature lever, of a fixed weight carried at one side of said lever and a loosely mounted sliding impact weight also carried by said lever and movable transversely thereto.

7. In a telegraphic transmitter of the gen eral character described, the combination with an electro-magnet and its armature lever, of a fixed weight carried by said lever,

and a loosely mounted Weight also carried by said lever.

8. In a telegraphic transmitter of the general character described, the combination with an armature lever of a Weight loosely mounted thereon to move transversely and controlled by and regulating the movement of said lever.

9. In a transmitter of electrical signals, the combination with its contact controller, of a loosely mounted weight controlled by said controller, said weight affecting the movement of said controller.

10. In a telegraphic transmitter, an electro-magnet, its armature lever, contacts controlled by said armature lever, whereby the circuit of said electro-magnet is made andhroken for actuation of said armature lever, and a loosely mounted weight carried by said armature lever for regulating the rate of its actuation by said electro-magnet.

ll. In a telegraphic transmitter, the combination with its electro-magnet and armature lever, of contacts controlled by said lever, a source of electric energy controlled by said contacts for energizing said electromagnet contacts, and a source of electric energy also controlled by said lever for sending dots and dashes into a line, and means whereby said electro-magnet, when energized for transmission of dots, is energized by a weaker current than when energized for transmission of dashes.

12. In a telegraphic transmitter the combination with an electromagnet, of its armature lever, local and line contacts controlled thereby, sources of electric energy controlled by said contacts, a signal forming member controlling said electro-magnet for transmission of dots and dashes, and means controlled by said signal forming member for energizing said electro-magnet with one strength of current for formation of dots, and with a greater strength of current for formation of dashes.

13. In a telegraphic transmitter, an electromagnet, contacts for transmission of dots and dashes controlled thereby, and means for energizing said electro-magnet with one strength of current for transmission of dots, and with a different strength of current for transmission of dashes.

In testimony whereof, I have hereunto subscribed my name.

PATRICK B. DELANY. Witnesses L. F. BROWNING, EDWARD C. DAVIDSON. 

